d&b audiotechnik polar data for CADP2
V1.4  11/1999

This data base includes .dev files which represent the polar data
and associated .dvd files which contain the 3D drawing of the cabinets.  

The polar data sets were processed assuming a horizontal symmetry of the
dispersion pattern of the cabinets. Data was measured for a complete
half sphere with 10 angle steps for azimuth and rotation (not just an
extrapolation from one vertical and one horizontal measurement).

The sensivities for the octave bands do not represent the efficiency
of the cabinet but relate to the whole system consisting of speaker and
controller/mainframe. The figures were tuned to give the the actual
system output with 0 dBu input signal and 0 dB controller input gain
setting when 0 dBW power is selected. The parameter "power" may
therefore not be used with the unit W but only with dBW (representing
the unit dBu). 

When the desired level distibution in the room has been reached, the
dBW figure of each device in the array table gives the input gain
setting of the corresponding contoller module. 

The following power figures (dBW) will give the max. SPL of the
systems (=max. controller input level in dBu):

C4-TOP      +14 (+17 for SPL peak)
C6/690      +16 (+19)
C7-TOP      +14 (+17)
E9          +12 (+15)
F2          +11 (+14)
F1          +13 (+16)
F1220       +15 (+18)
M1220       +15 (+18)
E1           +7 (+10)
E3           +9 (+12)
MAX         +13 (+16) 

These figures have been measured with pink noise signal. They are valid
for all octave bands.


---peculiarities---

subwoofers:

Data sets for subwoofer systems (B1, B2, E-18, C4-SUB, C7-SUB, E15-BX,
E12-SUB) don't contain useful acoustic information. They are only used for
displaying complete arrays of TOP and SUB cabinets in 3D graphics.

mechanical accessories:

Flying bar, single bar and speaker stand 02 drawings are also available.

E9:

the acoustic axis of the E9 has a 8 downward tilt. Therefore in
many applications the E9 may be used without any downward tilt of 
the cabinet (e.g. on a high stand). This non-symmetric dispersion is
now included in the polar data (the older 902-LS10 data set had been
processed asuming a vertical symmetry).
   
F2-LS (F2-v01, F2-60, F2-90):

F2-v01 stands for the old version of the F2-LS (before 9/93) with a
passively coupled tweeter. The main difference of the current version
(F2-60, without Tweeter, JBL2446 2" driver instead of JBL2445) is a
wider horizontal dispersion in the 8kHz band (60x40). 
F2-90 stands for the 90x40 version.

E3-LS (E3-90, E3-60):

The HF horn of the E3-LS (90x60) can be rotated through 90.
The angle in the filename relates to the horizontal dispersion of the
upright cabinet.

